package com.example.library.utils;

import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;

/**
 * 密码工具类
 */
public class PasswordUtils {

    private static final PasswordEncoder passwordEncoder = new BCryptPasswordEncoder();

    /**
     * 加密密码
     *
     * @param rawPassword 原始密码
     * @return 加密后的密码
     */
    public static String encode(String rawPassword) {
        return passwordEncoder.encode(rawPassword);
    }

    /**
     * 验证密码
     *
     * @param rawPassword     原始密码
     * @param encodedPassword 加密后的密码
     * @return 是否匹配
     */
    public static boolean matches(String rawPassword, String encodedPassword) {
        return passwordEncoder.matches(rawPassword, encodedPassword);
    }

    /**
     * 生成随机密码
     *
     * @param length 密码长度
     * @return 随机密码
     */
    public static String generateRandomPassword(int length) {
        String chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
        StringBuilder password = new StringBuilder();
        for (int i = 0; i < length; i++) {
            int index = (int) (Math.random() * chars.length());
            password.append(chars.charAt(index));
        }
        return password.toString();
    }

    /**
     * 验证密码强度
     * 密码强度要求：至少8个字符，包含大小写字母、数字和特殊字符
     *
     * @param password 密码
     * @return 是否符合强度要求
     */
    public static boolean isStrongPassword(String password) {
        if (password == null || password.length() < 8) {
            return false;
        }

        boolean hasUpper = false;
        boolean hasLower = false;
        boolean hasDigit = false;
        boolean hasSpecial = false;

        for (char c : password.toCharArray()) {
            if (Character.isUpperCase(c)) {
                hasUpper = true;
            } else if (Character.isLowerCase(c)) {
                hasLower = true;
            } else if (Character.isDigit(c)) {
                hasDigit = true;
            } else if (!Character.isLetterOrDigit(c)) {
                hasSpecial = true;
            }
        }

        return hasUpper && hasLower && hasDigit && hasSpecial;
    }

}